Selecting the Proper Spindle

Eltool Spindles

Because commercially available collets are never as compact as possible we developed Eltool style spindles designed to minimize the profile of the angle head. They employ our proprietary collets which draw up from the rear of the head with a screw (much like a tiny R8 collet).

ER Spindles

Where space allows, a commercially available ER-type spindle is generally the best choice. It will have more diametrical capacity, a wide range of sizes, and is available from your local tool suppliers. It is not as compact and the minimum bore size the head will fit into will increase.

Taperlock Spindle

A taperlock spindle is like a tiny Morse taper. The shank of the cutting tool is held in place by the binding action of the tapered spindle. Special geometry is required on the tool shank when using this spindle, as shown below.

Taperlock = Size 1D, 1M

Weldon Spindles

Weldon style spindles are a straight bore with a set screw from the side. They are very compact and allow for a larger diameter tool shank than do collet style spindles. They are not as versatile however as the shank size of the tool has to match the bore in the spindle which does not change.